Reactive Power Reallocation in the Distribution System with DSTATCOM

The depleted conventional energy sources and awareness approaching Green gas emissions, have forced the countries towards the integration of Distributed Energy Resources (DER) in the secondary distribution network. While integrating DER in the Distribution Network (DN) the performance of the network varies with respect to the seasonal variation of source and load. In addition to this the DN experiences unbalanced load in each phase, variable peak demand and continuously varying load profile creating disproportion load flow between real and reactive power. With the variation in generation and load, dip in power factor and variation in reactive power flow is observed in the underground lines. This paper addresses the impact of real and reactive power allocation for the seasonal variation of source and load demand on IEEE 37 node test feeder. Solar PV is integrated at remote locations of the feeder and load flow analysis is performed for different load profiles. Time series simulations are performed to analyze the dynamic behavior of the network. The nodal voltage solutions and power flow solutions are explored with and without Distribution static compensator (DSTATCOM). Switching sequence of the DSTATCOM for different seasons is computed and the reactive power reallocation is done for the DN. The improvement in voltage profile and power factor at various nodes with DSTATCOM has been demonstrated.